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thu thong » thuy thong, thu thang, thu tuong
sach tri » sach tai, sach tren, sach truc
cac khoa » cac khoan, cac khoi, dac khoa
khoa thu » khoa than, hoai thu, ho thu
dan khoa » dang khoa, da khoa, san khoa
so sach » so sanh, bo sach, co sach
tue cac » tu cac, tuc cac, te cac
tu sach » thu sach, su sach, te sach
sach xa » sach dao, sach nha, sach bai
khoa he » hoa he, khoa hoc, khong he
ke dan » le dan
xa ke » va ke, ba ke, ca ke
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